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Aguero has missed City's last four games with a hamstring problem and it means he's only played three times this season.
He explained: "If you want goals then I think he's still the ultimate goal machine.
"I know [Lionel] Messi and there has been so much mileage on the debate over the years but I still think Ronaldo still has the desire and want to be remembered as the greatest. He will in some people's eyes but he won't in others.
"He's still got a desire to score goals. More than anything on the field now, he just wants to score goals.
"He's at that period where his eyes light up every time there's a free-kick at whatever angle. Whenever he gets the chance to shoot he will. Even when others are better placed, forget that.
"He's unbelievable in the air, which we've seen in a Juventus shirt already.
"If he became available and Juve wanted out on him and Man City needed goals for their team then I don't think you should hesitate in going to get Cristiano Ronaldo.
"He's 35 and I still think he's got 18 months in him. If he came to Man City and the way they play I think he could go there and get 25 in his first season."
Ronaldo has scored 27 goals in Serie A in 2020 making him the top scorer in Europe's top five leagues, with an average of a goal every 73 minutes.
Sunday saw him net in Juventus' 1-1 draw with Lazio, but he hobbled off with an injury in the second half.
While he'd probably score a boatload of goals at the Etihad, his allegiances to City's bitter rivals Manchester United would make a move difficult.
'CR7' joined United as an 18-year-old and developed into one of the world's best players under Sir Alex Ferguson.
Three Premier League titles, a Champions League as well as being named 2008 Ballon d'Or winner saw him seal a then-record £80 million transfer to Real Madrid in 2009.
Would he turn out for United's 'noisy neighbours?'
Featured Image Credit: Footy Renders
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